In March 1989, an Exxon Valdez oil tanker ran aground in the Strait of Prince William in Alaska. [[$ 40 $]] million liters of oil were spilled into the sea, much of which drifted ashore, killing hundreds of thousands of animals. Oil and water do not mix, but the oil remains floating on the surface of the water like a raft. If the oil formed a raft that had an average thickness of [[$ 1.0\;\text {mm} $]], how much area did the oil cover?

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Answer: The oil would have covered an area of km[[$ ^2 $]].